Furnace.



F. E. SWIFT.

PURNAUE.

APPLIOATION FILED APR. 1, 1909.

949,783. Patented Feb. 22, 1910.

. 2 SHEETS-SHEET 1.

Witnemeo F. E. SWIFT. FURNACE.

APPLICATION FILED APR. 1, 1909.

Q49,783, Patented Feb. 22, 1910.

2 SHEBTSSHEET 2.

Wilma/sou UM mu.

UNITE dTATES PATENT OFFIQE.

FRANCIS E. SWIFT, OF DAYTON, OHIO, ASSIGNOB TO THE SWIFT FURNACE COMPANY, OF DAYTON, OHIO.

FURNACE.

snares.

Specification of Letters Patent.

Patented Feb. 22, 1910.

Application filed April 1, 1909. Serial No. 487,145;

To all whom it concern:

Be it known that I, FRANCIS E. SWIFT, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Furnaces; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to new and useful improvements in furnaces for house-heating purposes, either by heated air or steam or hot water systems.

The object of the invention is to provide a furnace which is adapted to any of the various kinds of fuel and particularly to the cheaper fuel known as slack.

A further object of my invention is to provide a furnace which is adapted to be operated economically in milder weather, such as prevails in the fall or early spring, and also may be run to its full capacity during the extremely cold weather, thereby insuring a proper degree of heat during the entire period when heat is required to greater or less degrees.

A further object of the invention is to provide such a character of furnace in .which difierent fuels may be used at one and at the same time, for example, soft and hard coal, coal and wood or gas with either of the foregoing fuels.

Preliminary to a detailed description of my invention, reference is made to the accompanying drawings, of which Figure 1, is a front elevation of my improved furnace. Fig. 2, is a cross sectional view on the line a a of Fig. 3. Fig. 8, is a longitudinal section on the line b b of Fig. 2.

In a detail description of the invention, similar reference characters indicate corresponding parts.

1 designates an outer casing which may be constructed of galvanized iron covered with asbestos or any other suitable material. This outer casing incloses the shell 2 of the furnace proper and which may be constructed of any suitable material preferably sheet iron or partly of brick, and may if desired be lined with fire clay at such places where the shell is apt to be subjected to hard firing. On each side of the furnace is located a fire box 3 which is provided with a grate 4, which may be of any suitable form according to the character of the fuel used. Below said grates are the ash pits t to which access is gained through individual front doors 6*. The fire boxes 3 are separated by an intervening space or chamber 5 the top 5 of which joins the side walls of said chamber and provides a table which may be used as a coking table when burning slack coal. At the top of the furnace and in the rear, a smoke outlet 8 provides a passage from the combustion chambers of the furnace to the horizontally-disposed smoke pipe or flue 10 which is provided with a damper 10, the latter controlling the passage of the products of combustion as they pass through said opening 8. On a side of the damper 10 is located a descending or circulating smoke flue 8 and on another side of said damper is located an ascending smoke fine 9, the said damper being located in the flue 10 between said pipes or flues 8' and 9. These flues 8 and 9 connect at their lower ends with smoke drums or fiues 9 9 which are located in the chamber or space 5 below the coking table 5 and between the fire boxes 3 3. The front ends of the drums 9 9 communicate with each other and thus there is provided a system of circulating pipes or flues at the rear of the furnace and extending down between the two fire boxes and out through the ascending smoke flue 9 to the chimney fine 10.

In the front wall of the furnace there is provided a covered hand hole 9 which permits access to be had to the horizontal circulating lines 9 9 for the purposes of cleaning the same when it may be desired. When the damper 10 is open as in Fig. 8, the smoke or products of combustion pass directly from the combustion chamber or chambers to the smoke pipe 10, but as will be readily seen, when said damper is closed, the smoke will pass into the descending smoke flue 8 to the. circulating drums 9 9, ascending smoke flue 9 and thence into the smoke pipe 10,

the heat thereof being utilized within the furnace before its passage to the flue 10. It will thus be seen that this arrangement of radiating flues between the fire boxes greatly increases the radiating surface of the furnace.

The fire boxes extend from the doors 11C 6 in the front of the furnace to the back I wall 7 of said furnace, and the space thereabove is provided with a removable wall or partition 17 which extends from the coking table 5 and terminates a suitable distance from the top of the furnace to permit. the heat to pass from one fire box to the other. This partition it will be seen separates said coking table into two parts, each serving as a coking table for its respective fire box. When only one side of the furnace is fired, this partition keeps the coal on the coking table near the fire, thereby securing a thorough coking of the coal. Cold air entering the space 1 below the furnace becomes thoroughly heated and passes upwardly in front of and around the sides of the shell and enters the hot air pipes 12 through which it is conducted to the place where it is desired to heat.

Under some conditions, for example, 111 small residences when the weather is not extremely cold, it may be desirable to run only one side of the furnace, that is to say, fire may be maintained in only one fire box; in such event, the coking table 5 is only utilized on one side of the partition 17. It will also be borne in mind that when gas as a fuelis used in one fire box only one side of the table need be used for feeding the fuel. The cheaper kind of fuel, such for example, as soft slack coal may be used without liability of the fines being clogged or choked up with soot, etc., as substantially all of such material is consumed in the combustion chamber. It is further stated that a peculiarity of the furnace is that it will hold fire a long time, and can be filled with line slack coal without the liability of gas accumulating in the combustion chamber to such an extent to cause any explosion or pufiing as is frequently the case in the ordinary furnace. The draft is very great and owing to this a large chimney is not required to enable the furnace to work well.

Having described my invention, I claim;

1. In a furnace for house-heating -pur-. poses, a shell having on the interior thereof two fire boxes, one located on each side, a coking table located between said fire boxes, and a partition extending from said coking table and dividing it in two parts.

2. In a furnace for house-heating purposes, a shell provided on its interior with 'two fire boxes, a coking table located between said fire boxes, a partition extending from said coking table and dividing it centrally and longitudinally, two comniunicatposes, a shell having a combustion chamber and two fire boxes therein, a coking table between said fire boxes, a partition plate'diriding said coking table longitudinally, two horizontal heat-radiating drums below said coking table and between the fire boxes, said drums communicating at their front ends, a smoke pipe leading from said combustion chamber, a descending fiue forming a communication between the smoke fine and one of said drums, an ascending flue forming a communication between the other of said drums and the smoke flue, and a damper in the smoke pipe between the descending and ascending fines.

In testimony whereof I afiix my signature, in presence of two witnesses.

FRANCIS E. Sl/VIFT. IV'itnesses: MATTHEW SIEBLER,

C. M. THEOBALD. 

